Analysis and Modeling of various Tapered Coplanar Waveguide

This paper proposes the analysis of investigations on various tapered Coplanar Waveguide (CPW) structures to achieve increase in phase shift per unit length and the reduction in line length. The analysis of the tapered CPW is important in order to obtain the characteristic impedance and phase velocity of the transmission line. The step tapered CPW structures proposed have the center conductor, the gap/ground or both the widths varying having constant characteristic impedances for a fixed line length. The conformal mapping method is applied to the proposed tapered CPW structures to obtain the electrical parameters of the transmission line. The obtained impedance can be utilized in the design of RF circuits such as phase shifter using MEMS bridges.